Figure 2

Percentage of EGFR staining by histopathological classification. Tumor sections were analyzed with respect to percent of each sample exhibiting staining for EGFR. The percentages of immunoreactive cells (staining percentage) were estimated by inspection and scored from 1 to 5, 1 (< 20% of the sample exhibiting staining); 2 (21-40% of the sample exhibiting staining); 3 (41-60% of the sample exhibiting staining); 4 (61-80% of the sample exhibiting staining), and 5 (81-100% of the specimen stained). The findings of the immunoreactivity for EGFR on each slide were then correlated with the meningioma histologic subtypes: benign, atypical, and malignant.